The marine rifted successions of the Late Carboniferous–Early Permian deposits from the South Qiangtang Block in the Rutog area, Northern Xizang: Sedimentary records of a rifting process on the northern Gondwana margin

ZHANG Yujie; ZHAI Qingguo; ZHANG Yichun; LIU Yiming; ZENG Xiaowen; AN Xianyin; LIU Shilei

doi:10.19826/j.cnki.1009-3850.2024.05007

2024 Vol. 44, No. 4

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ZHANG Yujie, ZHAI Qingguo, ZHANG Yichun, LIU Yiming, ZENG Xiaowen, AN Xianyin, LIU Shilei. 2024. The marine rifted successions of the Late Carboniferous–Early Permian deposits from the South Qiangtang Block in the Rutog area, Northern Xizang: Sedimentary records of a rifting process on the northern Gondwana margin. Sedimentary Geology and Tethyan Geology, 44(4): 773-795. doi: 10.19826/j.cnki.1009-3850.2024.05007

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ZHANG Yujie, ZHAI Qingguo, ZHANG Yichun, LIU Yiming, ZENG Xiaowen, AN Xianyin, LIU Shilei. 2024. The marine rifted successions of the Late Carboniferous–Early Permian deposits from the South Qiangtang Block in the Rutog area, Northern Xizang: Sedimentary records of a rifting process on the northern Gondwana margin. Sedimentary Geology and Tethyan Geology, 44(4): 773-795. doi: 10.19826/j.cnki.1009-3850.2024.05007

The marine rifted successions of the Late Carboniferous–Early Permian deposits from the South Qiangtang Block in the Rutog area, Northern Xizang: Sedimentary records of a rifting process on the northern Gondwana margin

1.
Chengdu Center , China Geological Survey (Geosciences Innovation Center of Southwest China), Chengdu 610218, China
2.
Research Center for Xizang Plateau Geology, China Geological Survey, Chengdu 610218, China
3.
Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China
4.
State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China
5.
University of Chinese Academy of Sciences, Nanjing 210049, China

Received Date: 23 April 2023

Revised Date: 24 May 2024

Accepted Date: 21 August 2023

Publish Date: 31 December 2024

Abstract

Abstract

The South Qiangtang Block (SQB) is widely acknowledged as part of the Cimmerian Continent, which rifted away from the northern Gondwana margin during the Early Permian, marking the initial opening of the Bangong-Nujiang Meso-Tethys Ocean. However, the sedimentary response to this rifting event remains unconfirmed, leaving the event ambiguous. In this study, five sedimentary successions are identified in the Rutog area, Northern Xizang, each characterized by distinct facies that record different stages in the tectonic evolution and climatic influences on the basin, along with associated changes in the rates of basin subsidence and sediment accommodation. Succession Ⅰ, formed in the Late Carboniferous to Asselian age, shows that glaciomarine sediments compensated for the sediment accommodation generated by the basin subsidence, resulting from tectonic activities and climatic factors in the early stage of the syn-rift. During the Sakmarian to early Artinskian age, the glaciomarine retrogradational sequence represented by the Zhanjin Formation (Succession Ⅱ) and the following progradational-aggradational sequences represented by the Qudi Formation (Succession Ⅲ) mark the climax and standstill stages of the first episode of the syn-rift tectonic activities, respectively. In the late Artinskian to Kungurian age, the second episode of syn-rift is manifested by the Succession Ⅳ and Ⅴ. And the former retrogradational sequence (Succession Ⅳ), reflected in the lower part of the Tunlonggongba Formation, indicates a climax stage of syn-rift tectonic activity, while the latter aggradational-progradational sequences (Succession Ⅴ), represented by the upper part of the Tunlonggongba Formation, mark a stage of tectonic quiescence. Therefore, these Early Permian sedimentary successions in the SQB are best explained by the tectonic subsidence resulting from the rifting of the SQB from the Gondwana margin, suggesting an early Permian timeline for the initial opening of the Bangong-Nujiang Meso-Tethys Ocean.
- South Qiangtang Block /
- Late Carboniferous–Early Permian /
- sedimentary filling sequences /
- rifting on the north Gondwana /
- Rutog area

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